/// Indicates a format's autofocus system. /// /// * `none`: Indicates that autofocus is not available /// * `contrastDetection`: Indicates that autofocus is achieved by contrast detection. Contrast detection performs a focus scan to find the optimal position /// * `phaseDetection`: Indicates that autofocus is achieved by phase detection. Phase detection has the ability to achieve focus in many cases without a focus scan. Phase detection autofocus is typically less visually intrusive than contrast detection autofocus enum AutoFocusSystem { contrastDetection, phaseDetection, none } AutoFocusSystem autoFocusSystemFromString(String string) { switch (string) { case 'contrast-detection': return AutoFocusSystem.contrastDetection; case 'phase-detection': return AutoFocusSystem.phaseDetection; case 'none': default: return AutoFocusSystem.none; } }